Abstract
An electrolytic cell having a cation-selective membrane Neosepta CM-1 was applied to treat solutions containing equimolar amounts of CuSO 4 and citric acid. The iridium oxide and platinum coated on titanium were used as the anode and cathode, respectively. The catholyte contained the citrate-chelated Cu(II) and the anolyte consisted of NaNO 3 . All experiments were carried out at different current densities (18.5–139 A m −2 ), initial catholyte pH (1.0–9.0) and Cu(II) concentration (5–30 mM), and initial anolyte NaNO 3 concentration (1–200 mM). An economically acceptable current efficiency (>50%) and recovery of Cu(II) and citrate (>96%) could be obtained when the feed concentration the chelated Cu(II) was sufficiently high.
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